Panning
Users can pan a picture, map, or web page by moving a finger on the trackpad, or, on BlackBerry devices with a touch
screen, users can use a finger to drag the content on the screen. The content moves in the same direction and at the same
rate that users move their finger.
Zooming
Users can zoom in to or out from items such as images, web pages, HTML email messages, maps, and attachments to view
the details of the item or to scan specific sections of the item.
User goal Action using the navigation keys Action using a touch screen
Zoom in. Click the trackpad.
• Pinch out.
• Tap the screen twice quickly in the
same location.
Zoom out. Press the Escape key.
• Pinch in.
• On zoomed in content, tap the screen
twice quickly in the same location.
Best practice: Zooming
• On zoomed in content, allow users to fit the content into the dimensions of the screen by pressing the Escape key twice
quickly.
• Assign shortcut keys for zooming in to and out from items. For example, in English, allow users to press "I" to zoom in
and "O" to zoom out.
UI Guidelines Strategies
36
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General
Weight and Dimensions
